Someone needs to seriously consider whether you should remain a member on THR.
Guess what, shooting ranges have a certain danger built into them. You weren't being "attacked". You knew it, your buddy knew it and the jury would know it.
Instead, you were deciding to use lethal force to deal with a communications problem in a dangerous activity you voluntarily took part in. You can no more shoot at some idiot at a gun range than you can shoot the crane operator on a construction site.
You are a dangerous person advocating an incredibly bad idea. I can only hope you go to jail for attempted murder rather than the real thing, and that no one is foolish enough to take any advice from you.